Evolution of Photo-induced defects in Ge-doped fiber/preform: influence of the drawing

被引：42

作者：

Alessi, A. ^{[1
]}

Girard, S. ^{[2
]}

Cannas, M. ^{[3
]}

Agnello, S. ^{[3
]}

Boukenter, A. ^{[1
]}

Ouerdane, Y. ^{[1
]}

机构：

[1] Univ St Etienne, CNRS, Lab H Curien, UMR 5516, F-42000 St Etienne, France

[2] CEA, DAM, DIF, F-91297 Arpajon, France

[3] Univ Palermo, Dipartimento Sci Fis & Astron, I-90123 Palermo, Italy

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 12期

关键词：

OPTICAL-FIBERS; BRAGG GRATINGS; LASER-PULSES; SIO2; GLASS; CENTERS; PREFORMS; GENERATION; INDEX; PHOTOSENSITIVITY; IRRADIATION;

D O I：

10.1364/OE.19.011680

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have studied the generation mechanisms of two different radiation-induced point defects, the Ge(1) and Ge(2) centers, in a germanosilicate fiber and in its original preform. The samples have been investigated before and after X-ray irradiation using the confocal microscopy luminescence and the electron paramagnetic resonance techniques. Our experimental results show the higher radiation sensitivity of the fiber as compared to the perform and suggest a relation between Ge(1) and Ge(2) generation. To explain our data we have used different models, finding that the destruction probability of the Ge(1) and Ge(2) defects is larger in fiber than in preform, whereas the generation one is similar. Finally we found that the higher radiation sensitivity of the fiber at low doses is essentially related to the presence of germanium lone pair center generated by the drawing. (C) 2011 Optical Society of America

引用

页码：11680 / 11690

页数：11

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